Carriage stop mechanism for lathes



Oct. 9, 1928. 1,686,743 F. c. DULL CARRIAGE STOP MECHANISM FOR LATHES Filed June 22, 1927 INVENTOR 4 (2,

.51 ATTORNEY is a side elevation, partly in section,

Patented Oct. 9, 1928.

nulr so STAT ESTPATENT OFFICE.

FRED 0. non, osfsrnunY, OHIO, ASSIGNOB TO THE MONARCH MACHINE TOOL cor/ir u on SIDNEY, 0111c,

A CORPORATION orfoHIo.

CARRIAGE STOP MECHANISM FOR LATHES.

Application filed June 22, 1927. Serial No. 200,663.

This invention relates to new and useful improvements in lathes.

It isone of the principal objects of my invention to provide a simple and efficient device for automatically disengaging the cross feed or diameter turning tools of lathes. The cross feed or diameter stop mechanism as ordinarily furnished on lathes is, in some cases, merely a hand measuring device, necessitating the operator actually disengaging thecross feed mechanism before the cuttingtool has reached the required diameter, and finishing the cut by hand by means of the cross feed screw. In other such mechanisms ordinarily furnished on lathes, mechanisms may actually, mechanism or other means, tool to a definite stop when the required diam eter' has been reached, but in no such mechanism so far developed does the mechanism automatically disengage the cross feeding mechanism.

It is another object ofmv inventionto provide a mechanism wherein it is possible to duplicate any one of a number ofdiameters from 1 to 6' or more, with the cutting tools operating either on the in feed or on the out feed and not only to have the-cutting tools automatically stopped accurately when the proper diameter has been reached, but also to automatically disengage the cross feeding mechanism, bringing it to a, definite and positive stop. 7 V c A further object of the invention is, to provide a device of this kind which will be simple in construction, positive in its operation, and

which can be applied to mechanisms of standard construction without material modification thereof. I 7

Other objects of theinventionwill appear as the device is, described in detail.

In the accompanying drawings, Figure 1 ffi apron of an engine lathe with its associated parts. Figure 2 is a top plan View of the .same, partly in section. And Figure 3 isan end view thereof, partly in section.-

In these drawings, Ihave illustrated one embodiment of my invention and have shown I the same as applied to a lathe mechanism of well-known construction, but it will beunderstood that the invention maybe applied to mechanisms of var-iouskinds, and that the departing from the spirit of the im the cross feed stop through a clutch bring the cutting device itself may take various forms vention. In these drawings I have shown only that part of the lathe mechanism with which the invention is directly connected.

,Referring to the accompanying drawings for a detailed desc'ription'of my invention,

the numerall designates an engine lathe, havng a movabletool rest 2. To the latter there 18 connected a cross feed screw 3 to which there is keyed a cross feed pinion i which meshes with across feed gear 5 having a hub 6 journaled in a member 7 secured to the apron 8. (SeeFigure 1.) v

The outer face of the gear 5 is concaved to receive a cone clutch member 9 pinned to across feed friction gear 10 which is free to turn with it on a shaft ll that passes through the hub .6 of the gear 5. Surrounding the shaft 11' between a shoulder in the interior of the hub 6 and the interior surface.

of a recess in the cone clutch member 9, is a spring'lfl. Against the compression of; this spring the clutch member 9.: is adapted to be drawn by a cross feed lever 13 pivotally secured by a pin 13 to-the outer end of the shaft 11. The latter,which is free to movevlongitudinally through its bearings, has securedto its inner end a collar 14: which isjin engagement with, a thrust bearing lo that in turn engages the hub of the clutch member 9 to force it into tight contact with the gear 5 when the shaft 11 is. drawn outwardly by a depressioneof the lever 13. The middle partof thislever is-pointed' as at 16 in Figure l, to engage a plate 17 secured to the member -7. which acts asan abutmentfor the lever when it is depressed to draw the clutch member 9. into engagement with the gear 5 The gear 10 is continuously driven by means not cross feed mechanism, when the gear.- 5 and cone 9 are engaged as abovedescribed.

Pivotally secured by a pin 1-8'tothe inner end of the lever 13 isa slotted head19 on the outer end of a shaft 20 longitudinally'movable in a hole 21- in a block 22 secured to the shaft 20 is a screw 23. Surrounding this screw between its-head 24 and an annular stationary member 25 in the hole- 21 is. a helical spring26 which is compressed When the shaft 20 is drawn outwardly by the lever 13.; Formed in the bottom of the outer end of the shaft 20 is a slot 27 which is brought to a point by the depression of the lever 13, to engage a tripv lever 28pivoted by a pin 29 shownto rotate the gear 5, and through it the apron 8, Securedtov the inner end of this adapted to engage a similarbutton 43 on the outer end of a lever 44.

dog 41 attached to the tool rest 2 t through bearings 31, 31 mounted on the carriage 30, is a rod or shaft 32 which is threaded at its middle portion to receive two spanner collars 33, 33 between which is a sleeve 34 formed at one end with a flange 35. Carried by the sleeve 34 between its flange 35 and I a retaining collar 36 is cylindrical stop turret 3'? formed with a radial hole adapted to receive at its inner end a spring tension ball 7 38 free to enter any one of a number of concave notches 89 formed in the periphery of the sleeve84. (See Figure 1). By turning the spanner collars 38, 83, the turret 3! may be moved to a desired position on the shaft 82.

The turret 37 is formed with a series of axial threaded holes to receive contact elements such as adjustable screws 40. These screws which are'sct for various diameters of the work to be turned, cooperate with a disconnect the cross feed drive mechanism.

By turning the turret 37 to a position to bring a desired adjustable stop screw 40 into the path of movement of the dog 41, the latter will engage the screw to automatically stop the cross feed mechanism at the time when the work has been turned to the diameter represented by that'screw. This accomplished by the following means.

Secured to the bottom part of the front end of the rod. 32 are cam projections such as the two hardened buttons 42, 42 that are This'lever is pivoted at its rear end by a pin 45 to the bearing block .31. Secured to the bottom partof the front end of this lever 44 is a hardened button 46 adapted to contact the lever 28 to disengage it from the slot 2'? in the shaft 20,

thereby releasing the clutch member 9 from the gear 5 to stop the cutting tool atthe predeterminedpoint. For instance, when the I to engage thebutton 43 on the lever 44, to

depress the lever, and through its engagement with the lever 28, disengage it from the shaft 20 to stop the cutting tool. Therefore, it is possible with my device, to automatically bring the cutting tool to a definite stop when a required diameter on the Work being turned has been reached.

When the trip lever 28 is depressed by the lever 44, it will engage a tension rod 47 that is slidable in a hole in a member 48 secured to the apron 8. The lower end of this rod engages a spring 49 which rests on a screw 50 in said hole. By means of this spring 0011- strnctionthe lever 28 will be under the influence of an upward force for entrance into the slot in the shaft 20 to hold the cross feed mechanism in positive engagement with the driving clutch when the handle is again depressed.

I do not desire to be limited to the number of stop screws 40 employed in theturret 37, as their number may be increased or diminished if desired to represent the diameter of the work to be turned.

My automatic cross feed stop device will disengage any type of cross feed mechanism whctl'ier it be of the cone friction, jaw clutch or sliding gear type. It will not only automatically stop, at the required diameter, the cutting tool when travelling in either direction, but will automatically disengageithe cross feed, making it unnecessary for the operator to perform this function, thereby making it absolutely fool proof and saving the time of the operator. t

Having described my invention, I claim:

1. In a lathe, a carriage, a tool rest free to move in either direction on said'carriage, cross-feed mechanism for advancing'said tool rest toward the work, driving means for said cross-feed mechanism, a clutch device for connecting the driving means to the crossfeed mechanism, a control device for holding a clutch engagement between the cross-feed and the driving means, a "shiftable member to actuate the control device to release the clutch from the cross-feed mechanism, a r0- tatable turret on said shiftable member, adjustable stop elements on'said turret, corresponding to the diameters of the work required, and a member on said tool rest for engagement with a selected stop element to move the shiftable member to release the clutch and stop the operation of the cross-feed mechanism when a required diameter on the Work has been reached.

2. In a lathe, a carriage, a tool rest free to move in either direction on said carriage, cross feed mechanism for advancing-said tool *rest'toward the work, driving means'for said cross feed'mechanism, a clutch device for con necting the driving means to the cross feed mechanism, said driving means being secured to the clutch member, a cross feed level for drawing the clutch member into positive engagement with the cross feed mechanism, a

shaft connected to said lever, a trip lever for.

engagement by said shaft to hold the clutch in positive engagement with the cross feed mechanism, a shiftable member, a projection on said member, means for engagement so i by said projection to contact the trip lever and disengage it from the shaft to release the clutch, an adjustable stop means on said shift able member, and a member on the tool rest to engage the adjustable stop means for the purpose specified.

3. In a lathe, a carriage, a tool rest free to move in either direction on said carriage,

' cross feed mechanism for advancing said tool rest toward the work, driving means for said cross feed mechanism, a clutch device for connecting the driving means to the. cross feed mechanism, a clutch engagement between the cross feed mechanism and the driving means, a shiftable member to actuate the control device to release the clutch from the cross feed mechanism, a rotatable turret on said shiftable member, adjustable stop elements on said turret corresponding to the diameters of the work required, and a dog on said tool rest for engagementwith a selected stop element to move the shiftable member to release the clutch and stop the operation of the cross feed mechanism when a required diameter on the work has been reached.

4. In a lathe, a carriage, a tool rest free to control device for holding amove in either direction on said carriage, cross feed mechanism for advanclng said tool rest toward the work, driving means for said 'shaft' containing a slot, connected to said lever, a trip lever adapted to be engaged bythe slot in said shaft to. hold the clutch in positive engagement with the cross feed mechanism, a shiftable rod, a cam projection on said rod, a lever pivotedbelow said rod for engagement by said cam projection to contact the trip lever and disengag'e'it from said shaft to release theclutch, an adjustable stop element on said rod, and a dog on the tool rest to engage the stop element for-the purpose specified.

' In witness whereof I have hereunto set my hand this 20th day of June, 1927.

FRED C. DULL. 

